"Where Bush Street roofed Stockton before slipping downhill into Chinatown, Spade paid his fare and left the taxicab." This is Dashiell Hammett's description of Sam Spade arriving at the scene where the body of his partner, Miles Archer, has been found in The Maltese Falcon.
In this photo, we are looking north on Stockton Street, through the tunnel. Bush Street runs across what looks like a bridge. Thus "Bush Street roofed Stockton."
Before the tunnel was opened in 1914, Stockton street rose steeply up one side of Nob Hill and ran down the other side. The part of Stockton the crests the hill can still be seen at the top of the photo. The original purpose of the tunnel was to create a level roadway for street cars.
The scene continues: "Spade crossed the sidewalk . . . went to the parapet, and resting his hands on the damp coping, looked down into Stockton Street." Sam Spade would have been standing at what looks like a stone fence on the bridge, facing in our direction, looking down.
"An automobile popped out of the tunnel beneath him, with a roaring swish, as if it had been blown out, and ran away." The white van in the photo did what Hammett is describing seconds before I snapped the shutter.
The scene changes as, "Spade turned from the parapet and walked up Bush Street to the alley where men were grouped.." That is, he walked to the left, as we view the scene. Today, at the mouth of that alley there is a brass plaque marking it as the place where, "______ shot Miles Archer." The plaque actually names the murderer. I refuse to do so.
The pages describing Spade's actions at the murder scene give much more detail about stairways, railings, buildings, and other details of this intersection. Obviously, Dashiell Hammett, who lived in San Francisco when he wrote The Maltese Falcon, walked this intersection and took detailed notes for this scene.
Somewhere I read that Elmore Leonard said, "I write about Detroit because I live in Detroit. If I lived in Buffalo, I'd write about Buffalo." Lessons from the masters.